When the Messenger of Allah traveled, he would say: "Allahumma inni a'udhu bika min wa'tha'is-safari, wa kabatil-munqalabi, wal-hawri ba'dal-kawri, wa da'watil-mazlumi, wa suw'il-munzari fil-ahli wal-mal (O Allah, I seek refuge with You from the hardships of travel and the sorrows of return, from loss after plenty, from the supplication of the one who has been wronged, and seeing some calamity befall my family or wealth.)"
Sunan an-Nasa'i Book 50, Hadith 71